7 Digestive & Excretory SystemsFirst the crayfish tears the food with their maxillae & maxillipeds.They chew their food with their mandiblesThe food passes through the esophagus to the stomach.

8 The digestive glands absorb nutrients, then the undigested material enters the intestine, and then exits the anus.Green glands are also used in the excretory system to remove waste; much like kidneys.

9 Circulatory & Respiratory SystemsOpen Circulatory SystemDorsal heart that pumps blood to the body cavity to bath the organs. It is then pumped to the gills.What do the gills do?Large surface area for gas exchangeThe gills are attached to each walking leg

11 Usually mate in the fall Reproductive SystemUsually mate in the fallThe male uses its swimmerets to transfer sperm to the female, where she keeps the sperm until spring.The eggs are then fertilized and kept along the female’s swimmerets until they hatch.

12 Chelicerae - subphylumClass: ArachnidaSpiders, mites, scorpionsMany use stingers or fangs with poison.How do spiders catch their prey?with webs or “trap doors”Scorpions hunt at night and hide during the day.Video

13 Only a few scorpions are poisonous enough to kill humans.Mites and ticks are the most abundant in this class.Ticks are parasitic and some carry diseases.Lyme’s diseaseRocky mountain spotted fever.Spider mites can damage and wipe out fruit trees or other trees.

17 Insects – 2nd Part of Ch. 39 VideoMost diverse and largest number of species of any class of organism.They were present on earth before the dinosaurs, over 300 million years ago.Differences from other arthropods1. 3 body segments  head, thorax, abdomenVideo

18 2. Head has 1 pair of antennae3. Thorax has 3 pairs of legs & 1 or 2 pair of wings.4. No wings or legs attached to the abdomen.

22 3 parts to the thorax1. Prothorax – pair of walking legs2. Mesothorax. – pair of walking legs3. Metathorax – pair of jumping legsForewings are attached to the mesothoraxHindwings are attached to the metathorax

25 Circulatory SystemOpen Circulatory SystemAn aorta is a large vessel that carries the blood on the dorsal side.2 Hearts along the aorta

26 Respiratory SystemNo lungs or gillsUse spiracles – openings along the abdomenThe spiracles lead to the tracheaNervous SystemBrain connected to a ventral nerve cordHas simple and complex eyes

27 Have antennaeTympanum for sensing soundReproductive SystemThe male deposits sperm into the seminal receptacle, which stores the sperm.The female uses its ovipositors to deposit her eggs in the ground.

28 Types of MetamorphosisIncomplete Metamorphosis1. Egg2. Nymph – immature form of an adult3. Adult – able to reproduce (wings)

32 The worker bee produces royal jelly to feed the queen beeThe worker also secretes wax to make the hive.The produces a pheromone called queen factor, which makes the other females sterile.Round Dance – tells the other bees food is within 50 metersWaggle Dance – tells the other bees food is greater than 50 meters.